Assessment of Trace Metals Concentration in Tree Barks as Indicator of Atmospheric Pollution within Ibadan City, South-West, Nigeria

Table 3

Correlation coefficient among metals in tree bark samples from all zones (bold correlations are significant at ).

	Pb	Cd	Zn	Cu	Co	Cr
Pb	1
Cd	0.40	1
Zn	0.70	0.31	1
Cu	0.27	0.50	0.79	1
Co	0.24	0.20	0.54	0.77	1
Cr	0.67	0.24	0.55	0.63	0.69	1